Fix test for PHP-815.

It started failing because the fix for PHP-816 introduced an extra check on the
ns parameter which this test has wrong.
Merged pull request #468
Make those tests more robust

My local config has mongo.native_long set to 1.
Merged pull request #470
Fixed PHP-831 and PHP-832: Add support for SASL authentication (Kerberos and PLAIN)
Fixed PHP-845: Ability to use different SPN on the driver for Kerberos Authentication
Fixed PHP-844: driver must authenticate before calling isMaster()